OWNER’S MANUAL
© 1996 MILLER Electric Mfg. Co.
OM-180 231 March 1996
Watertank L (PU 301)
1. Specifications
Recirculating Coolant System For Water-Cooled GTAW Torches And GMAW Guns
Use With Guns/Torches Rated Up To 600 Amperes
3 gal (11.4 L) Coolant Tank Capacity;
Maximum Cooling Capacity: 14,000 BTU/hr At 1.25 qt/min (1.2 L/min)
Dimensions: 23 in (584 mm) Long, 12 in (305 mm) Wide, 13-1/4 in (337 mm) High
Dimensions: 23 in (584 mm) Long, 12 in (305 mm) Wide, 13 1/4 in (337 mm) High
Weight: 39 lb (18 kg)
ST-801 189
115 Volt Models Use 5.9 Amperes, 50/60 Hertz, Single-Phase Input Power
230 Volt Models Use 3 Amperes, 50/60 Hertz, Single-Phase Input Power
2. Safety Symbol Definitions
Means Warning! Watch Out! There are possible hazards
with this procedure! The possible hazards are shown in
the adjoining symbols.
Have only trained and qualified persons install, operate,
or service this unit. Call your distributor if you do not
understand the directions. For WELDING SAFETY and
EMF information, read wire feeder and welding power
source manuals.
Beware of electric shock from wiring. Beware of moving parts.
Wear safety glasses with side shields. Recycle or dispose of used coolant in an environmen-
tally safe way.
3. Preparing Cooling Unit For Use
ST-801 193-A
1 Coolant Out Hose
2 Coolant In Hose
Fittings have 5/8-18 left-hand
threads. Connect hoses with prop-
er fittings as shown.
3 Coolant Tank Cap
Use table to select proper coolant,
and fill tank. Keep coolant level full.
4 Flow Indicator
5 Power Switch
MILLER Low
Conductivity Coolant
No. 174 599**
MILLER Aluminum Protecting
Coolant No. 174 600**;
Distilled Or Deionized Water OK
Above 32° F (0° C)
Tools Needed:
5/8 in
1
2 3 4 5
GTAW Or Where
HF* Is Used
GMAW Or Where Coolant
Contacts Aluminum Parts Or
Where HF* Not Used
Application
*HF: High Frequency Current
**MILLER coolants protect to -37° F (-38°C) and resist algae growth.
Coolant
OM-180 231 Page 2
4. Connections
ST-801 190-A / ST-801 191-A
1 Lift -Eye
If placing cooling unit on welding
power source, slots are provided in
bottom of unit so it fits over lift-eye.
To prevent overheating, make sure
cooling unit is positioned so airflow
is not restricted.
Y If welding power source has
a water valve, do not con-
nect hoses to water valve.
Connect hoses as shown.
Operation:
Turn power switch On. Flow indica-
tor spins to indicate that at least
0.53 qt/min (0.5 L/min) of coolant is
flowing.
GTAW Connections
GMAW Connections
1
OM-180 231 Page 3
5. Routine Maintenance
Y Turn Off all power and unplug unit before maintaining.
1 Month
Clean Coolant
Filter
Blow Out Heat
Exchanger Fins
6 Months
Replace
Cracked
Hoses
Replace
Unreadable
Labels
Change
Coolant (If
Using Water)
12 Months
Oil Motor
Change
Coolant (If
Using MILLER
Coolant)
3/8 in
Tools Needed:
6. Coolant Maintenance And Oiling Motor
ST-801 195-A / Ref. ST-801 194
1 Coolant Filter
Unscrew housing to clean filter.
Changing coolant: Drain coolant
by tipping unit forward. Fill with
clean water and run for 10 minutes.
Drain and refill.
2 Motor
Remove plugs and put about 15
drops of SAE 20 motor oil into each
oil port. Replace plugs.
. If replacing hoses, use hoses
compatible with ethylene gly-
col, such as buna-N, neo-
prene, or hypalon.
1
2
OM-180 231 Page 4
7. Troubleshooting
Trouble Remedy
Coolant system does not work. Be sure input power cord is plugged in to energized receptacle.
Check line fuses or circuit breaker, and replace or reset if necessary.
Motor overheated. Unit starts running when motor has cooled.
Have Factory Authorized Service Agent check Power switch and motor.
Decreased or no coolant flow. Add coolant.
Check for clogged hoses or coolant filter.
Disconnect pump, and check for sheared coupling. Replace coupling if necessary.
SA-135 796-A
Figure 7-1. Circuit Diagram For 115 And 230 Volts Models
INPUT POWER
OM-180 231 Page 5
Notes
OM-180 231 Page 6
8. Parts List
1
2
6
7
8
9
10
11
8
12
13
15
14
16
13
22
8
21
16
20
26
27
23
24
25
22
*
28
29
30
31
19
15
18
17
8
4
5
3
*Included in Item 19
ST-801 196-B
17
Figure 8-1. Complete Assembly
OM-180 231 Page 7
Description
Part
No.
Dia.
Mkgs.
Item
No.
Figure 8-1. Complete Assembly
Quantity
1 +166 562 WRAPPER 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 134 327 LABEL, warning general precautionary 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 174 042 PUMP COOLANT w/CLAMPS, (consisting of) 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 126 992 FITTING, hose brs barbed elb M 3/8tbg x 3/8 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 134 795 COUPLER, drive pump 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 MOT 173 264 MOTOR, 1/4hp 230VAC 50/60Hz 1425/1725rpm (230V model) 1. . . . . . . . . . . . . . . . . . . . .
6 MOT 173 263 MOTOR, 1/4hp 115VAC 50/60Hz 1425/1725rpm (115V model) 1. . . . . . . . . . . . . . . . . . . . .
7 166 570 BLADE, fan 9.000 5wg 38deg .500 bore cw (setscrew included) 1. . . . . . . . . . . . . . . . . . . . . . . . . .
8 174 044 TUBING, PVC .375 x .625 OD X 18.000 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9 176 746 CLAMP, 1-ear type nom dim .656 x .275 wide 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 168 293 PANEL, rear 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11 166 569 RADIATOR, heat exchanger 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12 168 267 TANK COOLANT 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13 174 043 TUBING, PVC .375 ID x .625 OD x 1.250 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14 166 608 CAP, tank screw-on w/vent 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15 174 045 TUBE, pick-up coolant 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16 136 369 TUBING, PVC .375 ID x .625 OD x 10.000 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17 178 248 HOSE, nprn brd No. 1 x .375 ID x 4.000 black 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18 166 560 RING, ring ext .500 shaft grv x .042thk 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19 166 564 FILTER, in-line 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20 168 254 CLIP, filter mounting 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21 174 047 NUT, .250-20 special 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22 166 559 INDICATOR, flow (consisting of) 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23 166 568 PADDLE, slow indication 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24 166 566 O-RING, 1.301 ID x .070CS 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25 166 567 LENS, flow indicator 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26 S1 177 396 SWITCH, rocker DPST 15A 250VAC 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27 177 399 PANEL, front 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28 NAMEPLATE, (order by model and serial number) 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29 166 571 FITTING, coolant barbed 3/8tbg 5/8-18 female 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30 PLG1 136 038 CABLE, power 16ga 3c (230V model) 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
30 PLG1 176 836 CABLE, power 10ft 16ga (115V model) 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31 139 042 BUSHING, strain relief .270/.480 id x .804 mtg hol 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+When ordering a component originally displaying a precautionary label, the label should also be ordered.
BE SURE TO PROVIDE MODEL AND SERIAL NUMBER WHEN ORDERING REPLACEMENT PARTS.
OM-180 231 Page 8
Notes
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3
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Miller WATERTANK l (PU 301) Owner's manual
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